Passage is a five metre high sculpture, combining constructed and living elements. The constructed and carved element takes the form of two crossing arches, echoing the vaulted ceilings found in cathedrals. This structure is the starting point for a sculpture that will take several decades to reach maturity. The living element consists of four Wild Service Trees planted at the foot of each leg.

Passage will change its form over several decades. The mass of the oak arches will initially dominate the young trees. As time passes the trees will grow beyond the original structure. The trees will be trained, pruned and grafted in simple, but specific ways, using the oak structure as a framework with which to grow. When the trees grow beyond the scale of the structure they will be allowed to develop freely. When the structure eventually rots and is removed, the living element will hold in its form the memory of the constructed sculpture.